﻿//-----------------------------------------------
//
//	This file is part of the Siv3D Engine.
//
//	Copyright (c) 2008-2025 Ryo Suzuki
//	Copyright (c) 2016-2025 OpenSiv3D Project
//
//	Licensed under the MIT License.
//
//-----------------------------------------------

# include <array>
# include <Siv3D/TextureFormat.hpp>
# include <Siv3D/StringView.hpp>

enum DXGI_FORMAT
{
	DXGI_FORMAT_UNKNOWN = 0,
	DXGI_FORMAT_R32G32B32A32_TYPELESS = 1,
	DXGI_FORMAT_R32G32B32A32_FLOAT = 2,
	DXGI_FORMAT_R32G32B32A32_UINT = 3,
	DXGI_FORMAT_R32G32B32A32_SINT = 4,
	DXGI_FORMAT_R32G32B32_TYPELESS = 5,
	DXGI_FORMAT_R32G32B32_FLOAT = 6,
	DXGI_FORMAT_R32G32B32_UINT = 7,
	DXGI_FORMAT_R32G32B32_SINT = 8,
	DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
	DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
	DXGI_FORMAT_R16G16B16A16_UNORM = 11,
	DXGI_FORMAT_R16G16B16A16_UINT = 12,
	DXGI_FORMAT_R16G16B16A16_SNORM = 13,
	DXGI_FORMAT_R16G16B16A16_SINT = 14,
	DXGI_FORMAT_R32G32_TYPELESS = 15,
	DXGI_FORMAT_R32G32_FLOAT = 16,
	DXGI_FORMAT_R32G32_UINT = 17,
	DXGI_FORMAT_R32G32_SINT = 18,
	DXGI_FORMAT_R32G8X24_TYPELESS = 19,
	DXGI_FORMAT_D32_FLOAT_S8X24_UINT = 20,
	DXGI_FORMAT_R32_FLOAT_X8X24_TYPELESS = 21,
	DXGI_FORMAT_X32_TYPELESS_G8X24_UINT = 22,
	DXGI_FORMAT_R10G10B10A2_TYPELESS = 23,
	DXGI_FORMAT_R10G10B10A2_UNORM = 24,
	DXGI_FORMAT_R10G10B10A2_UINT = 25,
	DXGI_FORMAT_R11G11B10_FLOAT = 26,
	DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
	DXGI_FORMAT_R8G8B8A8_UNORM = 28,
	DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
	DXGI_FORMAT_R8G8B8A8_UINT = 30,
	DXGI_FORMAT_R8G8B8A8_SNORM = 31,
	DXGI_FORMAT_R8G8B8A8_SINT = 32,
	DXGI_FORMAT_R16G16_TYPELESS = 33,
	DXGI_FORMAT_R16G16_FLOAT = 34,
	DXGI_FORMAT_R16G16_UNORM = 35,
	DXGI_FORMAT_R16G16_UINT = 36,
	DXGI_FORMAT_R16G16_SNORM = 37,
	DXGI_FORMAT_R16G16_SINT = 38,
	DXGI_FORMAT_R32_TYPELESS = 39,
	DXGI_FORMAT_D32_FLOAT = 40,
	DXGI_FORMAT_R32_FLOAT = 41,
	DXGI_FORMAT_R32_UINT = 42,
	DXGI_FORMAT_R32_SINT = 43,
	DXGI_FORMAT_R24G8_TYPELESS = 44,
	DXGI_FORMAT_D24_UNORM_S8_UINT = 45,
	DXGI_FORMAT_R24_UNORM_X8_TYPELESS = 46,
	DXGI_FORMAT_X24_TYPELESS_G8_UINT = 47,
	DXGI_FORMAT_R8G8_TYPELESS = 48,
	DXGI_FORMAT_R8G8_UNORM = 49,
	DXGI_FORMAT_R8G8_UINT = 50,
	DXGI_FORMAT_R8G8_SNORM = 51,
	DXGI_FORMAT_R8G8_SINT = 52,
	DXGI_FORMAT_R16_TYPELESS = 53,
	DXGI_FORMAT_R16_FLOAT = 54,
	DXGI_FORMAT_D16_UNORM = 55,
	DXGI_FORMAT_R16_UNORM = 56,
	DXGI_FORMAT_R16_UINT = 57,
	DXGI_FORMAT_R16_SNORM = 58,
	DXGI_FORMAT_R16_SINT = 59,
	DXGI_FORMAT_R8_TYPELESS = 60,
	DXGI_FORMAT_R8_UNORM = 61,
	DXGI_FORMAT_R8_UINT = 62,
	DXGI_FORMAT_R8_SNORM = 63,
	DXGI_FORMAT_R8_SINT = 64,
	DXGI_FORMAT_A8_UNORM = 65,
	DXGI_FORMAT_R1_UNORM = 66,
	DXGI_FORMAT_R9G9B9E5_SHAREDEXP = 67,
	DXGI_FORMAT_R8G8_B8G8_UNORM = 68,
	DXGI_FORMAT_G8R8_G8B8_UNORM = 69,
	DXGI_FORMAT_BC1_TYPELESS = 70,
	DXGI_FORMAT_BC1_UNORM = 71,
	DXGI_FORMAT_BC1_UNORM_SRGB = 72,
	DXGI_FORMAT_BC2_TYPELESS = 73,
	DXGI_FORMAT_BC2_UNORM = 74,
	DXGI_FORMAT_BC2_UNORM_SRGB = 75,
	DXGI_FORMAT_BC3_TYPELESS = 76,
	DXGI_FORMAT_BC3_UNORM = 77,
	DXGI_FORMAT_BC3_UNORM_SRGB = 78,
	DXGI_FORMAT_BC4_TYPELESS = 79,
	DXGI_FORMAT_BC4_UNORM = 80,
	DXGI_FORMAT_BC4_SNORM = 81,
	DXGI_FORMAT_BC5_TYPELESS = 82,
	DXGI_FORMAT_BC5_UNORM = 83,
	DXGI_FORMAT_BC5_SNORM = 84,
	DXGI_FORMAT_B5G6R5_UNORM = 85,
	DXGI_FORMAT_B5G5R5A1_UNORM = 86,
	DXGI_FORMAT_B8G8R8A8_UNORM = 87,
	DXGI_FORMAT_B8G8R8X8_UNORM = 88,
	DXGI_FORMAT_R10G10B10_XR_BIAS_A2_UNORM = 89,
	DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
	DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
	DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
	DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,
	DXGI_FORMAT_BC6H_TYPELESS = 94,
	DXGI_FORMAT_BC6H_UF16 = 95,
	DXGI_FORMAT_BC6H_SF16 = 96,
	DXGI_FORMAT_BC7_TYPELESS = 97,
	DXGI_FORMAT_BC7_UNORM = 98,
	DXGI_FORMAT_BC7_UNORM_SRGB = 99,
	DXGI_FORMAT_AYUV = 100,
	DXGI_FORMAT_Y410 = 101,
	DXGI_FORMAT_Y416 = 102,
	DXGI_FORMAT_NV12 = 103,
	DXGI_FORMAT_P010 = 104,
	DXGI_FORMAT_P016 = 105,
	DXGI_FORMAT_420_OPAQUE = 106,
	DXGI_FORMAT_YUY2 = 107,
	DXGI_FORMAT_Y210 = 108,
	DXGI_FORMAT_Y216 = 109,
	DXGI_FORMAT_NV11 = 110,
	DXGI_FORMAT_AI44 = 111,
	DXGI_FORMAT_IA44 = 112,
	DXGI_FORMAT_P8 = 113,
	DXGI_FORMAT_A8P8 = 114,
	DXGI_FORMAT_B4G4R4A4_UNORM = 115,

	DXGI_FORMAT_P208 = 130,
	DXGI_FORMAT_V208 = 131,
	DXGI_FORMAT_V408 = 132,


	DXGI_FORMAT_FORCE_UINT = 0xffffffff
} DXGI_FORMAT;

enum GL_CONSTANTS
{
	GL_RGBA = 0x1908,
	GL_UNSIGNED_BYTE = 0x1401,
	GL_UNSIGNED_SHORT = 0x1403,
	GL_SRGB8_ALPHA8 = 0x8C43,
	GL_RG16F = 0x822F,
	GL_RG = 0x8227,
	GL_HALF_FLOAT = 0x140B,
	GL_R32F = 0x822E,
	GL_RED = 0x1903,
	GL_FLOAT = 0x1406,
	GL_RGB10_A2 = 0x8059,
	GL_UNSIGNED_INT_10_10_10_2 = 0x8036,
	GL_R11F_G11F_B10F = 0x8C3A,
	GL_RGB = 0x1907,
	GL_RGBA8 = 0x8058,
	GL_RGBA16F = 0x881A,
	GL_RG32F = 0x8230,
	GL_RGBA32F = 0x8814,
	GL_RG16UI = 0x823A,
};

enum WGPU_CONSTANTS
{
	TextureFormat_R32Float = 0x0C,
	TextureFormat_RG16Uint = 0x0F,
	TextureFormat_RG16Float = 0x11,
	TextureFormat_RGBA8Unorm = 0x12,
	TextureFormat_RGBA8UnormSrgb = 0x13,
	TextureFormat_RGB10A2Unorm = 0x19,
	TextureFormat_RG11B10Ufloat = 0x1A,
	TextureFormat_RG32Float = 0x1C,
	TextureFormat_RGBA16Float = 0x21,
	TextureFormat_RGBA32Float = 0x22,
};

namespace s3d
{
	namespace detail
	{
		struct TextureFormatData
		{
			StringView name;

			int32 DXGIFormat;

			int32 GLInternalFormat;

			int32 GLFormat;

			int32 GLType;

			int32 WGPUFormat;

			// 1 ピクセル当たりのサイズ
			uint32 pixelSize;

			// チャンネル数
			uint32 num_channels;

			bool isSRGB;
		};

		static constexpr std::array<TextureFormatData, 11> TextureFormatPropertytable =
		{ {
			{ U"Unknown", DXGI_FORMAT_UNKNOWN, 0, 0, 0, 0, 0, 0, false },
			{ U"R8G8B8A8_Unorm", DXGI_FORMAT_R8G8B8A8_UNORM, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, TextureFormat_RGBA8Unorm, 4, 4, false },
			{ U"R8G8B8A8_Unorm_SRGB", DXGI_FORMAT_R8G8B8A8_UNORM_SRGB, GL_SRGB8_ALPHA8, GL_RGBA, GL_UNSIGNED_BYTE, TextureFormat_RGBA8UnormSrgb, 4, 4, true },
			{ U"R16G16_Unorm", DXGI_FORMAT_R16G16_UNORM, GL_RG16UI, GL_RG, GL_UNSIGNED_SHORT, TextureFormat_RG16Uint, 4, 2, false  },
			{ U"R16G16_Float", DXGI_FORMAT_R16G16_FLOAT, GL_RG16F, GL_RG, GL_HALF_FLOAT, TextureFormat_RG16Float, 4, 2, false },
			{ U"R32_Float", DXGI_FORMAT_R32_FLOAT, GL_R32F, GL_RED, GL_FLOAT, TextureFormat_R32Float, 4, 1, false },
			{ U"R10G10B10A2_Unorm", DXGI_FORMAT_R10G10B10A2_UNORM, GL_RGB10_A2, GL_RGBA, GL_UNSIGNED_INT_10_10_10_2, TextureFormat_RGB10A2Unorm, 4, 4, false },
			{ U"R11G11B10_UFloat", DXGI_FORMAT_R11G11B10_FLOAT, GL_R11F_G11F_B10F, GL_RGB, GL_FLOAT, TextureFormat_RG11B10Ufloat, 4, 3, false },
			{ U"R16G16B16A16_Float", DXGI_FORMAT_R16G16B16A16_FLOAT, GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT, TextureFormat_RGBA16Float, 8, 4, false },
			{ U"R32G32_Float", DXGI_FORMAT_R32G32_FLOAT, GL_RG32F, GL_RG, GL_FLOAT, TextureFormat_RG32Float, 8, 2, false },
			{ U"R32G32B32A32_Float", DXGI_FORMAT_R32G32B32A32_FLOAT, GL_RGBA32F, GL_RGBA, GL_FLOAT, TextureFormat_RGBA32Float, 16, 4, false },
		} };
	}

	StringView TextureFormat::name() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].name;
	}

	int32 TextureFormat::DXGIFormat() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].DXGIFormat;
	}

	int32 TextureFormat::GLInternalFormat() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].GLInternalFormat;
	}

	int32 TextureFormat::GLFormat() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].GLFormat;
	}

	int32 TextureFormat::GLType() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].GLType;
	}

	int32 TextureFormat::WGPUFormat() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].WGPUFormat;
	}

	uint32 TextureFormat::pixelSize() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].pixelSize;
	}

	uint32 TextureFormat::num_channels() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].num_channels;
	}

	bool TextureFormat::isSRGB() const noexcept
	{
		return detail::TextureFormatPropertytable[FromEnum(m_value)].isSRGB;
	}
}
